btrfs: Remove unused readahead spinlock
The reada_lock in struct btrfs_device was only initialised, and not actually used. That's good because there's another lock also called reada_lock in the btrfs_fs_info that was quite heavily used. Remove this one. Signed-off-by: NMatthew Wilcox <mawilcox@microsoft.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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